diff options
| -rw-r--r-- | ChangeLog | 2 | ||||
| -rw-r--r-- | sysdeps/x86_64/memchr.S | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/rawmemchr.S | 54 |
3 files changed, 57 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index c0d26fccce..6a28967a24 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,7 @@ 2009-04-09 Ulrich Drepper <drepper@redhat.com> + * sysdeps/x86_64/rawmemchr.S: New file. + * stdio-common/vfprintf.c (vfprintf): Slightly more compact code. Simplified code and possible copy problem fixed. diff --git a/sysdeps/x86_64/memchr.S b/sysdeps/x86_64/memchr.S index 644362d565..09ba6d4f8d 100644 --- a/sysdeps/x86_64/memchr.S +++ b/sysdeps/x86_64/memchr.S @@ -1,5 +1,4 @@ -/* strlen(str) -- determine the length of the string STR. - Copyright (C) 2009 Free Software Foundation, Inc. +/* Copyright (C) 2009 Free Software Foundation, Inc. Contributed by Ulrich Drepper <drepper@redhat.com>. This file is part of the GNU C Library. diff --git a/sysdeps/x86_64/rawmemchr.S b/sysdeps/x86_64/rawmemchr.S new file mode 100644 index 0000000000..c3bd771635 --- /dev/null +++ b/sysdeps/x86_64/rawmemchr.S @@ -0,0 +1,54 @@ +/* Copyright (C) 2009 Free Software Foundation, Inc. + Contributed by Ulrich Drepper <drepper@redhat.com>. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + + + .text +ENTRY (rawmemchr) + movd %esi, %xmm1 + movq %rdi, %rcx + punpcklbw %xmm1, %xmm1 + andq $~15, %rdi + punpcklbw %xmm1, %xmm1 + orl $0xffffffff, %esi + movdqa (%rdi), %xmm0 + pshufd $0, %xmm1, %xmm1 + subq %rdi, %rcx + pcmpeqb %xmm1, %xmm0 + shl %cl, %esi + pmovmskb %xmm0, %ecx + leaq 16(%rdi), %rdi + andl %esi, %ecx + jnz 1f + +2: movdqa (%rdi), %xmm0 + leaq 16(%rdi), %rdi + pcmpeqb %xmm1, %xmm0 + pmovmskb %xmm0, %ecx + testl %ecx, %ecx + jz 2b + +1: bsfl %ecx, %ecx + leaq -16(%rcx,%rdi), %rax + ret +END (rawmemchr) + +strong_alias (rawmemchr, __rawmemchr) +libc_hidden_builtin_def (__rawmemchr) |